Series light-string troubleshooting tool



FIG. 1 Top view from the side of the testing tool.

FIG. 2 Top view from the rear of the testing tool.

FIG. 3 Top plan view of the tester.

FIG. 4 Bottom view of the tester.

FIG. 5 Side view of the tester.

FIG. 6 Front end view of the tester; and,

FIG. 7 Rear end view of the tester. 

The ornamental design for a series light-string troubleshooting tool, as shown and described. 